In 4.1 (and maybe even 4.0), we used to build with checking enable in stage1 to check some bugs but now with the toplevel bootstrap, this no longer happens.
-- Summary: [4.2 Regression] Not building with checking in stage1 Product: gcc Version: 4.2.0 Status: UNCONFIRMED Severity: normal Priority: P3 Component: bootstrap AssignedTo: unassigned at gcc dot gnu dot org ReportedBy: pinskia at gcc dot gnu dot org http://gcc.gnu.org/bugzilla/show_bug.cgi?id=29544